Boiler.



W. A. BREWSTER. BOILER.

APPLICATION FILED JUNE 8, 1910.

1,005,593, Patented 001110, 1911.

alliarn Aflre 1086a)" WILLIAM ANDREW BREWSTER, OF VICTORIA, BRITISH COLUMBIA, CANADA.

BOILER.

Specification of Letters Patent.

Patented Oct. 10, 1911.

Application filed June 8, 1910. Serial No. 565,806.

To all whom it may concern:

Be it known that I, W'ILLIAM A. BREW- STER, a subject of the King of Great Britain, residing at Victoria, in the Province of British Columbia and Dominion of Canada, have invented new and useful Improvements in Boilers, of which the following is a specification.

This invention relates to boilers adapted especially for hot water heating plants, and it has for its object to produce a simple and efficient boiler embodying the principle of tubular boiler construction, whereby an extensive heating surface shall be provided, and whereby the boiler tubes shall be combined with deflectors or bafiies, so that the products of combustion will be conducted in a circuitous course from the fire place to the final exit, thereby insuring efiiciency in operation and economy in the consumption of fuel.

With these and other ends in view which will readily appear as the nature of the invention is better understood, the same consists in the improved construction and novel arrangement and combination of parts, which will be hereinafter fully described and particularly pointed out in the claims.

In the accompanying drawing has been illustrated, a simple and preferred form of the invention, it being, however, understood that no limitation is necessarily made to the precise structural details therein exhibited, but that changes, alterations and modifications within the scope of the invention may be resorted to when desired.

In the drawing: Figure 1 is a longitudinal vertical sectional view of a boiler constructed in accordance with the invention; Fig. 2 is a vertical transverse sectional view taken on the plane indicated by the line 22 in Fig. 1.

Corresponding parts in both figures are denoted by like characters of reference.

The boiler casing which is usually constructed of cast iron, although other material may be employed, includes a front wall 1, a rear wall 2, and side walls 3, 3, the front wall being provided with doors 1 and 5, communicating respectively with the fire box and with the ash pit. The grate includes a frame 6 having the rocking grate.

bars 7 which may be operated in any suitable well known manner. The frame 6 has an annular groove 8 to support the fire box 9. The fire box, it will be observed, occupies only a portion of the front end of the casing, the interior of which is lined with fire brick as shown at F, said lining being continued to within a suitable distance of the upper edges of the side walls 3 and the rear wall 2 so as to form a ledge or shelf L. The top of the casing is formed by a water box 10 independent of the front, rear and side walls and having adjacent to its rear end an opening 11 for the escape of the products of combustion, and adjacent to its front end a depending leg 12 with an inclined rear wall 13. The water box is supported upon the ledge or shelf L formed by the upper edge of the lining F, and said water box is confined between the upper ends of the side walls and the front and rear walls of the casing, being thus firmly supported in position against lateral displacement without the necessity of the use of bolts or the like, whereby the structure of the water box would be weakened and possibility of leaking increased. The top of the water box 10 is connected adjacent to its front end with the tubes 14 leading to the heating system.

Arranged transversely upon thebottom of the casing, adjacent to the rear end of the latter and supporting the rear wall lining F, is a water box 15 having an inclined front wall 16, which is disposed in parallel relation to the rear wall 13 of the leg 12 of the water box 10. The water box 15 has a hand hole 17 provided with a covering plate 18. The water box 15 is connected with the leg 12 of the water box 10 by means of a plurality of tubes 19 which are suitably connected with the inclined walls 13 and 16. Of these connecting tubes, any suitable number may be employed, said tubes being preferably arranged in staggered relation, as will appear by reference to Fig. 2. The water box 15 is provided at one end with an inlet 20, communicating with the heating system.

Secured upon the under side of the water box 10, adjacent to the exit opening 11, is a deflector 21 which is apertured for the passage of the tubes 19. A second deflector 22, which is similarly apertured for the passage of the boiler tubes, is supported upon the rear wall of the fire box 9.

For the purpose of admitting air to the combustion chamber 23 in rear of the fire box, one of the side walls of the casing is provided with an aperture 24, for which a suitable closure will be provided.

From the foregoing description, taken in connection with the drawing hereto annexed, the operation and advantages of this invention will be readily understood. The prod nets of combustion rising from the fire box will pass between the boiler tubes in front of the deflector 22, thence downwardly between the deflectors 22 and 21 beneath the latter, and finally upward to the exit opening 11 which is to be connected in the usual manner with the chimney flue. The water box 10 will be subjected to the direct impact of the flames, and the water contained in the said box, as well as in the fines, will become rapidly heated, thus establishing circulation in the heating system from which the water returns through the opening 20 to the water box 15, from which it will again ascend through the tubes 19.

The general construction of the improved boiler is simple and inexpensive, and it has been found to be thoroughly efficient for the purpose for which it is provided.

Having thus described the invention, what is claimed is:

1. A water tube boiler comprising'a casing including front, rearand side wallmembers, the front wall member having doors communicating with the furnace and the ash pit, and linings adjacent to the side and rear wall members and terminating short of the upper edges thereof to constitute a ledge or shelf, a water box supported upon said ledge or shelf, said water box being confined between the upper ends of the front, rear and side wall members, and said water box having a smoke exit extending therethrough, said water box being also provided adjacent to its front end with a depending leg having an inclined rear wall, a rear water box arranged below the top water box and having an inclined front wall, and inclined tubes connecting the inclined front wall of the rear water box with the inclined rear wall of the depending leg at the front end of the top water box, the rear box being provided with an inlet at one end and the top box being provided with upwardly extending outlets adjacent to the front end thereof,

said casing containing also a fire box, and,

deflectors associated with the fire box and the top water box to support the inclined tubes.

2. A water tube boiler comprising a casing including front, rear and side wall members, linings adjacent to the said end rear wall members terminating below the upper edges of said wall members, a rear water box supporting the rear lining and having an aperture communicating with an aperture in the rear wall member, a closure for said apertures, a top water box supported upon the linings and confined between the upper ends of the wall members, inclined tubes connecting the top water box with the rear water box, a fire box within the casing, and inclined deflectors associated with the fire box and with the top water box to support the inclined tubes.

WlLLIAM ANDREW BREWSTER.

WVitnesses J. GREGG, J. GREGG.

Copies of this patent may be obtained for five centseach, by addressing the Commissioner of Patents.

Washington, D. G. 

